JP4672620B2 - Cover structure of internal combustion engine - Google Patents

Cover structure of internal combustion engine Download PDF

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Publication number
JP4672620B2
JP4672620B2 JP2006230952A JP2006230952A JP4672620B2 JP 4672620 B2 JP4672620 B2 JP 4672620B2 JP 2006230952 A JP2006230952 A JP 2006230952A JP 2006230952 A JP2006230952 A JP 2006230952A JP 4672620 B2 JP4672620 B2 JP 4672620B2
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Prior art keywords
cover
combustion engine
internal combustion
cooling water
sprocket
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JP2008051077A (en
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正明 根来
玲奈 黒須
展孝 脇田
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2006230952A priority Critical patent/JP4672620B2/en
Priority to EP07012522A priority patent/EP1895138B1/en
Priority to BRPI0702759-1A priority patent/BRPI0702759A/en
Priority to US11/895,064 priority patent/US7556013B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/007—Adaptations for cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/04—Arrangements of liquid pipes or hoses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • General Details Of Gearings (AREA)

Description

本発明は、内燃機関のカバー構造に関し、特に、自動二輪車に搭載される内燃機関の冷却装置の冷却水配管のカバー構造に関する。   The present invention relates to a cover structure for an internal combustion engine, and more particularly to a cover structure for a cooling water pipe of a cooling device for an internal combustion engine mounted on a motorcycle.

従来の内燃機関のカバー構造として、内燃機関の出力軸に接続されるドライブスプロケットを覆うスプロケットカバーに、少なくとも水ポンプと内燃機関の冷却系とを連通する冷却水配管を被覆保護する保護カバーを一体に設けるものが提案されている（例えば、特許文献１参照）。   As a cover structure of a conventional internal combustion engine, a sprocket cover that covers a drive sprocket connected to the output shaft of the internal combustion engine is integrated with a protective cover that covers and protects at least a cooling water pipe that communicates the water pump and the cooling system of the internal combustion engine. (See, for example, Patent Document 1).

実公平７−５５２９１号公報No. 7-55291

ところで、内燃機関のコンパクト化を目的として、クランク軸と出力軸との軸間を短縮した内燃機関が提案されており、このような内燃機関では、出力軸に接続されるドライブスプロケットと冷却装置の冷却水配管とが車幅方向において重なるため、上記特許文献１に記載の保護カバーでは、冷却水配管を被覆保護することが困難であった。   By the way, for the purpose of downsizing the internal combustion engine, an internal combustion engine in which the distance between the crankshaft and the output shaft is shortened has been proposed. In such an internal combustion engine, a drive sprocket connected to the output shaft and a cooling device are not provided. Since the cooling water pipe overlaps in the vehicle width direction, it is difficult to cover and protect the cooling water pipe with the protective cover described in Patent Document 1.

本発明は、上記事情に鑑みてなされたもので、その目的は、クランク軸と出力軸との軸間を短縮した内燃機関であっても、内燃機関の冷却装置の冷却水配管を被覆保護することができる内燃機関のカバー構造を提供することにある。   The present invention has been made in view of the above circumstances, and its purpose is to cover and protect the cooling water piping of the cooling device for the internal combustion engine, even in an internal combustion engine in which the distance between the crankshaft and the output shaft is shortened. An object of the present invention is to provide a cover structure for an internal combustion engine.

上記目的を達成するために、請求項１に記載の発明は、内燃機関の出力軸に接続される駆動力伝達機構の一部を覆うように配置される第１カバーと、内燃機関を冷却するための冷却装置と、を備える内燃機関のカバー構造において、第１カバーの外方に第２カバーを配置し、第１カバーと第２カバーとの間に冷却装置の冷却水配管を通過させ、第２カバーは、第１カバー及び内燃機関に設けられる嵌合孔に挿入嵌合されることにより取り付けられることを特徴とする。 In order to achieve the above object, according to a first aspect of the present invention, a first cover disposed so as to cover a part of a driving force transmission mechanism connected to an output shaft of an internal combustion engine, and the internal combustion engine are cooled. And a cooling device for the internal combustion engine, the second cover is disposed outside the first cover, the cooling water piping of the cooling device is passed between the first cover and the second cover , The second cover is attached by being inserted and fitted into a fitting hole provided in the first cover and the internal combustion engine .

請求項２記載の発明は、請求項１記載の発明の構成に加えて、第２カバーの下端部には、一端部が外気に開放されるホースを案内するガイド部と、ガイド部と連通する開口が形成されることを特徴とする。 According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the lower end portion of the second cover is in communication with the guide portion for guiding the hose whose one end portion is opened to the outside air, and the guide portion. An opening is formed.

請求項１に記載の内燃機関のカバー構造によれば、第１カバーの外方に第２カバーを配置し、第１カバーと第２カバーとの間に冷却装置の冷却水配管を通過させるため、クランク軸と出力軸との軸間を短縮した内燃機関であっても、内燃機関の冷却装置の冷却水配管を被覆保護することができる。また、冷却水配管を被覆保護するので、内燃機関の外観性を向上することができる。さらに、第１カバー及び第２カバーの２つのカバーにより内燃機関の放射音を低減することができるので、内燃機関の静粛性を向上することができる。   According to the cover structure of the internal combustion engine according to claim 1, the second cover is disposed outside the first cover, and the cooling water pipe of the cooling device is passed between the first cover and the second cover. Even in an internal combustion engine in which the distance between the crankshaft and the output shaft is shortened, the cooling water piping of the cooling device for the internal combustion engine can be covered and protected. Further, since the cooling water pipe is covered and protected, the appearance of the internal combustion engine can be improved. Furthermore, since the radiated sound of the internal combustion engine can be reduced by the two covers of the first cover and the second cover, the quietness of the internal combustion engine can be improved.

さらに、請求項１に記載の内燃機関のカバー構造によれば、第２カバーは、第１カバー及び内燃機関に設けられる嵌合孔に挿入嵌合されることにより取り付けられるため、第２カバーの組み付け性を向上することができる。 Further, according to the cover structure of the internal combustion engine according to claim 1 , the second cover is attached by being inserted and fitted into the fitting hole provided in the first cover and the internal combustion engine. Assembling property can be improved.

請求項２に記載の内燃機関のカバー構造によれば、第２カバーの下端部には、一端部が外気に開放されるホースを案内するガイド部と、ガイド部と連通する開口が形成されるため、ホースを別途クランプ等により固定する必要がないので、部品点数を削減することができる。 According to the cover structure for an internal combustion engine according to claim 2, the lower end portion of the second cover, and a guide portion for guiding a hose having one end opened to the outside air, the opening communicating with the guide portion is formed For this reason, it is not necessary to separately fix the hose with a clamp or the like, so the number of parts can be reduced.

以下、本発明に係る内燃機関のカバー構造の一実施形態について、添付図面に基づいて詳細に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る内燃機関のカバー構造を搭載した内燃機関の側面図、図２は第２カバーを取り外した状態の内燃機関の側面図、図３は第１カバーの単品を外方から見た側面図、図４は図３のＡ−Ａ線矢視断面図、図５は第２カバーの単品を外方から見た側面図、図６は図５のＢ矢視図、図７は図６のＣ矢視図である。 Hereinafter, an embodiment of a cover structure for an internal combustion engine according to the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
1 is a side view of an internal combustion engine equipped with a cover structure for an internal combustion engine according to the present invention, FIG. 2 is a side view of the internal combustion engine with a second cover removed, and FIG. 3 is a single view of the first cover from the outside. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a side view of the second cover as viewed from the outside, and FIG. 6 is a view taken in the direction of arrow B in FIG. FIG. 7 is a view taken in the direction of arrow C in FIG.

まず、内燃機関１０は、図１に示すように、内部に不図示の変速機が備えられるクランクケース１１と、クランクケース１１の上部前方に一体形成されるシリンダブロック１２と、シリンダブロック１２の上端部に固定されるシリンダヘッド１３と、シリンダヘッド１３の上端部の開口を閉塞するシリンダヘッドカバー１４と、クランクケース１１の左側面の開口を閉塞するジェネレータカバー１５と、内燃機関１０を冷却するための冷却装置２０と、を備える。なお、図中符号１１ａはクランク軸である。   First, as shown in FIG. 1, the internal combustion engine 10 includes a crankcase 11 having a transmission (not shown) therein, a cylinder block 12 integrally formed in front of the upper portion of the crankcase 11, and an upper end of the cylinder block 12. A cylinder head 13 fixed to the cylinder, a cylinder head cover 14 that closes the opening of the upper end of the cylinder head 13, a generator cover 15 that closes the opening of the left side surface of the crankcase 11, and an internal combustion engine 10 for cooling And a cooling device 20. In the figure, reference numeral 11a denotes a crankshaft.

また、クランクケース１１の左側面には、不図示の変速機の出力軸１６が突設されており、この出力軸１６には、駆動力伝達機構の一部であるドライブスプロケット１７が接続される。また、ドライブスプロケット１７には、駆動力伝達機構の一部であるドライブチェーン１７ａが掛け回される。   An output shaft 16 of a transmission (not shown) protrudes from the left side surface of the crankcase 11, and a drive sprocket 17 that is a part of the driving force transmission mechanism is connected to the output shaft 16. . A drive chain 17a, which is a part of the drive force transmission mechanism, is wound around the drive sprocket 17.

冷却装置２０は、主として、クランクケース１１のドライブスプロケット１７の下方に配設される水ポンプ２１と、クランクケース１１の前端面に配設されるオイルクーラー２２と、クランクケース１１の上端部に配設されるサーモスタットバルブ２３と、シリンダブロック１２及びシリンダヘッド１３内に形成される不図示のウォータージャケットと、内燃機関１０の前方に配置される不図示のラジエータと、を備え、水ポンプ２１、オイルクーラー２２、サーモスタットバルブ２３、不図示のウォータージャケット、及び不図示のラジエータはそれぞれゴム製の冷却水配管２４，２５，２６，２７により連通される。   The cooling device 20 is disposed mainly at the water pump 21 disposed below the drive sprocket 17 of the crankcase 11, the oil cooler 22 disposed on the front end surface of the crankcase 11, and the upper end portion of the crankcase 11. Provided with a thermostat valve 23, a water jacket (not shown) formed in the cylinder block 12 and the cylinder head 13, and a radiator (not shown) disposed in front of the internal combustion engine 10, a water pump 21, oil The cooler 22, the thermostat valve 23, the water jacket (not shown), and the radiator (not shown) are connected to each other by rubber cooling water pipes 24, 25, 26, and 27, respectively.

従って、本実施形態の内燃機関１０は、冷却装置２０の水ポンプ２１がドライブスプロケット１７の下方に配設されるため、従来の内燃機関よりも、クランク軸１１ａと出力軸１６との軸間が短縮されている。   Therefore, in the internal combustion engine 10 of the present embodiment, the water pump 21 of the cooling device 20 is disposed below the drive sprocket 17, so that the distance between the crankshaft 11a and the output shaft 16 is greater than that of the conventional internal combustion engine. It has been shortened.

そして、本実施形態では、図１及び図２に示すように、冷却装置２０の冷却水配管２４，２５は、カバー構造３０により被覆保護される。このカバー構造３０は、クランクケース１１の左側面に固定され、ドライブスプロケット１７を覆うように配置されるスプロケットカバー（第１カバー）３１と、スプロケットカバー３１及びジェネレータカバー１５の外側面に取り付けられ、スプロケットカバー３１の外方に所定の間隔を存して配置される冷却水配管カバー（第２カバー）３２と、を備える。そして、スプロケットカバー３１と冷却水配管カバー３２との間に冷却装置２０の冷却水配管２４，２５を縦断するように通過させることによって、冷却水配管２４，２５が冷却水配管カバー３２により被覆保護される。   In this embodiment, as shown in FIGS. 1 and 2, the cooling water pipes 24 and 25 of the cooling device 20 are covered and protected by the cover structure 30. The cover structure 30 is fixed to the left side surface of the crankcase 11 and is attached to the outer surface of the sprocket cover 31 and the generator cover 15, a sprocket cover (first cover) 31 disposed so as to cover the drive sprocket 17, A cooling water pipe cover (second cover) 32 disposed at a predetermined interval outside the sprocket cover 31. Then, the cooling water pipes 24 and 25 of the cooling device 20 are vertically passed between the sprocket cover 31 and the cooling water pipe cover 32 so that the cooling water pipes 24 and 25 are covered and protected by the cooling water pipe cover 32. Is done.

スプロケットカバー３１は、図３及び図４に示すように、側面視略台形形状の板状部材であって、上縁部及び下縁部には、ボルト挿通孔３３ａを有する固定片３３がそれぞれ形成されており、この固定片３３，３３をクランクケース１１の左側面にボルト締結することにより固定される（図２参照）。また、スプロケットカバー３１の外側面には嵌合凸部３４が２箇所形成されており、この嵌合凸部３４の外端面に形成される取付孔３４ａには、後述する冷却水配管カバー３２の係合突部３７を挿入嵌合するための嵌合孔３５ａを有するゴム製のグロメット３５が取り付けられる。なお、図中符号３６は、スプロケットカバー３１の剛性を向上させるための補強リブである。   As shown in FIGS. 3 and 4, the sprocket cover 31 is a plate-like member having a substantially trapezoidal shape when viewed from the side, and a fixing piece 33 having bolt insertion holes 33a is formed on the upper edge portion and the lower edge portion, respectively. The fixing pieces 33 are fixed to the left side surface of the crankcase 11 with bolts (see FIG. 2). Further, two fitting projections 34 are formed on the outer surface of the sprocket cover 31, and a mounting hole 34 a formed on the outer end surface of the fitting projection 34 has a cooling water pipe cover 32 described later. A rubber grommet 35 having a fitting hole 35a for inserting and fitting the engaging protrusion 37 is attached. In the figure, reference numeral 36 denotes a reinforcing rib for improving the rigidity of the sprocket cover 31.

ジェネレータカバー１５は、図２に示すように、その後端部に板状の取付ステー１５ａが形成されており、この取付ステー１５ａに形成される不図示の取付孔には、スプロケットカバー３１の嵌合凸部３４と同じく、後述する冷却水配管カバー３２の係合突部３７を挿入嵌合するための嵌合孔３５ａを有するゴム製のグロメット３５が取り付けられる。   As shown in FIG. 2, the generator cover 15 has a plate-like mounting stay 15a formed at the rear end thereof, and the sprocket cover 31 is fitted into a mounting hole (not shown) formed in the mounting stay 15a. Similar to the convex portion 34, a rubber grommet 35 having a fitting hole 35a for inserting and fitting an engaging projection 37 of a cooling water piping cover 32 described later is attached.

冷却水配管カバー３２は、図５〜図７に示すように、側面視略台形形状の板状部材であって、その内側面には、スプロケットカバー３１及びジェネレータカバー１５のグロメット３５の嵌合孔３５ａに対応する位置に、嵌合孔３５ａに挿入嵌合させるための係合突部３７がそれぞれ形成される。そして、冷却水配管カバー３２は、その係合突部３７をスプロケットカバー３１及びジェネレータカバー１５のグロメット３５の嵌合孔３５ａにそれぞれ挿入嵌合させることにより取り付けられる。また、冷却水配管カバー３２は、スプロケットカバー３１との間に冷却水配管２４，２５を通過させるためのスペースを形成するために、平面視略Ｌ字状に形成される。また、冷却水配管カバー３２の前端縁は、ジェネレータカバー１５の外周面に沿うように円弧形状に形成される。   As shown in FIGS. 5 to 7, the cooling water piping cover 32 is a plate-like member having a substantially trapezoidal shape when viewed from the side, and the inner surface thereof has a fitting hole for the sprocket cover 31 and the grommet 35 of the generator cover 15. Engagement protrusions 37 are formed at positions corresponding to 35a to be inserted and fitted into the fitting holes 35a. The cooling water pipe cover 32 is attached by inserting and fitting the engaging protrusions 37 into the fitting holes 35 a of the sprocket cover 31 and the grommet 35 of the generator cover 15. The cooling water pipe cover 32 is formed in a substantially L shape in plan view in order to form a space for allowing the cooling water pipes 24 and 25 to pass between the cooling water pipe cover 32 and the sprocket cover 31. Further, the front end edge of the cooling water pipe cover 32 is formed in an arc shape so as to follow the outer peripheral surface of the generator cover 15.

また、冷却水配管カバー３２の下端部には、下方に向かって内側に傾斜する傾斜部３２ａが形成されており、この傾斜部３２ａには、大径のブリーザホース（一端部が外気に解放されるホース）１８及び小径のブリーザホース（一端部が外気に解放されるホース）１９を案内するガイド部３８と、このガイド部３８と連通する開口３９が形成される。そして、ガイド部３８は、開口３９の上側に大径のブリーザホース１８を、下側に小径のブリーザホース１９を並べて配置する（図１参照）。なお、ブリーザホース１８，１９としては、例えば、内燃機関１０内のブローバイガスを排出するブリーザホース、不図示の燃料タンク内の燃料の水蒸気を排出するブリーザホース、及び冷却装置２０のリザーブタンクのブリーザホース等を挙げることができる。   In addition, an inclined portion 32a that is inclined inwardly downward is formed at the lower end portion of the cooling water pipe cover 32. The inclined portion 32a has a large-diameter breather hose (one end portion is released to the outside air). Hose) 18 and a small-diameter breather hose (a hose whose one end is released to the outside air) 19, and an opening 39 communicating with the guide portion 38. And the guide part 38 arrange | positions the large diameter breather hose 18 above the opening 39, and arrange | positions the small diameter breather hose 19 below (refer FIG. 1). The breather hoses 18 and 19 include, for example, a breather hose that discharges blow-by gas in the internal combustion engine 10, a breather hose that discharges water vapor of fuel in a fuel tank (not shown), and a breather of a reserve tank of the cooling device 20. A hose etc. can be mentioned.

このように構成された内燃機関１０のカバー構造３０では、スプロケットカバー３１及びジェネレータカバー１５のグロメット３５の嵌合孔３５ａに冷却水配管カバー３２の係合突部３７を挿入嵌合することにより、冷却水配管カバー３２がスプロケットカバー３１及びジェネレータカバー１５に取り付けられ、スプロケットカバー３１の外方に配置される。これにより、スプロケットカバー３１と冷却水配管カバー３２との間にスペースが形成され、このスペースに冷却水配管２４，２５を通過させることによって、冷却水配管２４，２５が冷却水配管カバー３２により被覆保護される。また、スプロケットカバー３１及びジェネレータカバー１５と冷却水配管カバー３２との間にゴム製のグロメット３６が配設されるので、各カバー１５，３１，３２の振動を低減することができる。   In the cover structure 30 of the internal combustion engine 10 configured as described above, the engagement protrusion 37 of the cooling water pipe cover 32 is inserted and fitted into the fitting hole 35a of the grommet 35 of the sprocket cover 31 and the generator cover 15. A cooling water piping cover 32 is attached to the sprocket cover 31 and the generator cover 15, and is disposed outside the sprocket cover 31. Thereby, a space is formed between the sprocket cover 31 and the cooling water piping cover 32, and the cooling water piping 24, 25 is covered with the cooling water piping cover 32 by passing the cooling water piping 24, 25 through this space. Protected. Further, since the rubber grommet 36 is disposed between the sprocket cover 31 and the generator cover 15 and the cooling water piping cover 32, vibrations of the covers 15, 31, 32 can be reduced.

以上説明したように、本実施形態の内燃機関１０のカバー構造３０によれば、第１カバー３１の外方に第２カバー３２を配置し、第１カバー３１と第２カバー３２との間に冷却装置２０の冷却水配管２４，２５を通過させるため、クランク軸１１ａと出力軸１６との軸間を短縮した内燃機関１０であっても、内燃機関１０の冷却装置２０の冷却水配管２４，２５を被覆保護することができる。また、冷却水配管２４，２５を被覆保護するので、内燃機関１０の外観性を向上することができる。また、第１カバー３１及び第２カバー３２の２つのカバーにより内燃機関１０の放射音を低減することができるので、内燃機関１０の静粛性を向上することができる。さらに、ドライブスプロケット１７の外方にゴム製の冷却水配管２４，２５を配置するので、内燃機関１０の放射音をさらに低減することができる。   As described above, according to the cover structure 30 of the internal combustion engine 10 of the present embodiment, the second cover 32 is disposed outside the first cover 31 and between the first cover 31 and the second cover 32. Even in the case of the internal combustion engine 10 in which the distance between the crankshaft 11a and the output shaft 16 is shortened in order to pass the cooling water pipes 24 and 25 of the cooling device 20, the cooling water piping 24 and 25 can be covered and protected. Moreover, since the cooling water pipes 24 and 25 are covered and protected, the appearance of the internal combustion engine 10 can be improved. In addition, since the radiated sound of the internal combustion engine 10 can be reduced by the two covers of the first cover 31 and the second cover 32, the quietness of the internal combustion engine 10 can be improved. Furthermore, since the rubber cooling water pipes 24 and 25 are disposed outside the drive sprocket 17, the radiated sound of the internal combustion engine 10 can be further reduced.

また、本実施形態の内燃機関１０のカバー構造３０によれば、第２カバー３２は、第１カバー３１及び内燃機関１０に設けられる嵌合孔３５ａに挿入嵌合されることにより取り付けられるため、第２カバー３２の組み付け性を向上することができる。また、第２カバー３２が、第１カバー３１と内燃機関１０とに跨って取り付けられるので、第２カバー３２の取り付けを確実にすることができる。また、第１カバー３１の負担を低減することができるので、第１カバー３１の剛性を確保しつつ軽量化を図ることができる。   Further, according to the cover structure 30 of the internal combustion engine 10 of the present embodiment, the second cover 32 is attached by being inserted and fitted into the fitting hole 35a provided in the first cover 31 and the internal combustion engine 10, The assembling property of the second cover 32 can be improved. Further, since the second cover 32 is attached across the first cover 31 and the internal combustion engine 10, the attachment of the second cover 32 can be ensured. Moreover, since the burden of the 1st cover 31 can be reduced, weight reduction can be achieved, ensuring the rigidity of the 1st cover 31. FIG.

さらに、本実施形態の内燃機関１０のカバー構造３０によれば、第２カバー３２の下端部には、一端部が外気に開放されるホース１８，１９を案内するガイド部３８と、ガイド部３８と連通する開口３９が形成されるため、ホース１８，１９を別途クランプ等により固定する必要がないので、部品点数を削減することができる。また、開口３９は、第２カバー３２の傾斜部３２ａに形成されるので、開口３９を外部から目立たなくすることができる。また、ガイド部３８により、開口３９の上側に大径のホース１８を配置し、下側に小径のホース１９を配置するため、小径のホース１９が側面視で外部に露出するのを防止することができるので、内燃機関１０の外観性を向上することができる。   Furthermore, according to the cover structure 30 of the internal combustion engine 10 of the present embodiment, at the lower end portion of the second cover 32, a guide portion 38 for guiding the hoses 18 and 19 whose one end portion is open to the outside air, and the guide portion 38. Since the opening 39 communicating with the hose 18 and 19 is formed, it is not necessary to separately fix the hoses 18 and 19 with a clamp or the like, so the number of parts can be reduced. Further, since the opening 39 is formed in the inclined portion 32a of the second cover 32, the opening 39 can be made inconspicuous from the outside. Further, since the large-diameter hose 18 is disposed above the opening 39 and the small-diameter hose 19 is disposed below the opening 39 by the guide portion 38, the small-diameter hose 19 is prevented from being exposed to the outside in a side view. Therefore, the appearance of the internal combustion engine 10 can be improved.

本発明に係る内燃機関のカバー構造を搭載した内燃機関の側面図である。1 is a side view of an internal combustion engine equipped with a cover structure for an internal combustion engine according to the present invention. 第２カバーを取り外した状態の内燃機関の側面図である。It is a side view of an internal combustion engine in the state where the 2nd cover was removed. 第１カバーの単品を外方から見た側面図である。It is the side view which looked at the single item of the 1st cover from the outside. 図３のＡ−Ａ線矢視断面図である。FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. 第２カバーの単品を外方から見た側面図である。It is the side view which looked at the single item of the 2nd cover from the outside. 図５のＢ矢視図である。FIG. 6 is a view taken in the direction of arrow B in FIG. 5. 図６のＣ矢視図である。It is C arrow line view of FIG.

符号の説明Explanation of symbols

１０ 内燃機関
１１ クランクケース
１１ａ クランク軸
１５ ジェネレータカバー
１５ａ 取付ステー
１６ 出力軸
１７ ドライブスプロケット（駆動力伝達機構の一部）
１７ａ ドライブチェーン（駆動力伝達機構の一部）
１８，１９ ブリーザホース（一端部が外気に解放されるホース）
２０ 冷却装置
２１ 水ポンプ
２４，２５，２６，２７ 冷却水配管
３０ カバー構造
３１ スプロケットカバー（第１カバー）
３２ 冷却水配管カバー（第２カバー）
３３ 固定片
３３ａ ボルト挿通孔
３４ 嵌合凸部
３４ａ 取付孔
３５ グロメット
３５ａ 嵌合孔
３６ 補強リブ
３７ 係合突部
３８ ガイド部
３９ 開口 DESCRIPTION OF SYMBOLS 10 Internal combustion engine 11 Crankcase 11a Crankshaft 15 Generator cover 15a Mounting stay 16 Output shaft 17 Drive sprocket (a part of drive force transmission mechanism)
17a Drive chain (part of drive force transmission mechanism)
18, 19 Breather hose (hose whose one end is released to the outside air)
20 Cooling device 21 Water pump 24, 25, 26, 27 Cooling water piping 30 Cover structure 31 Sprocket cover (first cover)
32 Cooling water piping cover (second cover)
33 fixed piece 33a bolt insertion hole 34 fitting convex part 34a mounting hole 35 grommet 35a fitting hole 36 reinforcing rib 37 engaging protrusion 38 guide part 39 opening

Claims (2)

内燃機関の出力軸に接続される駆動力伝達機構の一部を覆うように配置される第１カバーと、前記内燃機関を冷却するための冷却装置と、を備える内燃機関のカバー構造において、
前記第１カバーの外方に第２カバーを配置し、
前記第１カバーと前記第２カバーとの間に前記冷却装置の冷却水配管を通過させ、
前記第２カバーは、前記第１カバー及び前記内燃機関に設けられる嵌合孔に挿入嵌合されることにより取り付けられることを特徴とする内燃機関のカバー構造。 In a cover structure for an internal combustion engine, comprising: a first cover arranged to cover a part of a driving force transmission mechanism connected to an output shaft of the internal combustion engine; and a cooling device for cooling the internal combustion engine.
Arranging a second cover outside the first cover;
Passing the cooling water piping of the cooling device between the first cover and the second cover ;
The cover structure for an internal combustion engine, wherein the second cover is attached by being inserted and fitted into a fitting hole provided in the first cover and the internal combustion engine . 前記第２カバーの下端部には、一端部が外気に開放されるホースを案内するガイド部と、前記ガイド部と連通する開口が形成されることを特徴とする請求項１に記載の内燃機関のカバー構造。   2. The internal combustion engine according to claim 1, wherein a lower end portion of the second cover is formed with a guide portion for guiding a hose whose one end portion is opened to the outside, and an opening communicating with the guide portion. Cover structure.
JP2006230952A 2006-08-28 2006-08-28 Cover structure of internal combustion engine Expired - Fee Related JP4672620B2 (en)

Priority Applications (4)

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JP2006230952A JP4672620B2 (en) 2006-08-28 2006-08-28 Cover structure of internal combustion engine
EP07012522A EP1895138B1 (en) 2006-08-28 2007-06-26 Cover structure of an internal combustion engine
BRPI0702759-1A BRPI0702759A (en) 2006-08-28 2007-08-01 cover structure of an internal combustion engine
US11/895,064 US7556013B2 (en) 2006-08-28 2007-08-23 Cover structure for a cooling system component of an internal combustion engine, and engine incorporating same

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US10018112B2 (en) 2013-06-05 2018-07-10 Wise Motor Works, Ltd. Internal combustion engine with paired, parallel, offset pistons
JP6069116B2 (en) 2013-06-26 2017-02-01 本田技研工業株式会社 Cover structure of an internal combustion engine for a motorcycle
JP6826971B2 (en) * 2017-11-15 2021-02-10 本田技研工業株式会社 Saddle-type vehicle
CA3021866C (en) 2017-11-22 2019-09-10 Wise Motor Works, Ltd. Internal combustion engine with paired, parallel, offset pistons
DE102019118206A1 (en) 2018-07-06 2020-01-09 Honda Motor Co., Ltd. engine
US11578647B2 (en) 2020-03-11 2023-02-14 Arctic Cat Inc. Engine
CN112610354A (en) * 2020-12-16 2021-04-06 重庆怡之驰机械有限公司 Three-column engine box body for automobile

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EP1895138A2 (en) 2008-03-05
BRPI0702759A (en) 2008-04-22
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EP1895138A3 (en) 2010-09-08
US7556013B2 (en) 2009-07-07
EP1895138B1 (en) 2011-07-27

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